There are a number of different worms that can affect your dog. They include roundworms, tapeworms, hookworms, whipworms and heartworms. Some will live in your dogs intestines and some in their tissue. Many worms do not pose a problem for your dog at all, and you will not even be aware that they are even there. Some worms your dog will be able to tolerate in small numbers, but in high numbers they can create serious problems.

As a general rule your dog should be treated every six months for roundworms and tapeworms. These are the most common worm types, with roundworm being the bigger problem out of the two.